package com.itheima.putige.putige.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.putige.putige.common.BaseContext;
import com.itheima.putige.putige.common.R;
import com.itheima.putige.putige.entity.ShoppingCart;
import com.itheima.putige.putige.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * 购物车
 */
@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart) {
        log.info("购物车数据：{}", shoppingCart);
        //设置用户id,指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        //查询当前菜品或者套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId, currentId);
        if (dishId != null) {
            //添加到购物车的是菜品
            lqw.eq(ShoppingCart::getDishId, dishId);
        } else {
            //添加到购物车的是套餐
            lqw.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }
        //查询当前菜品或者套餐是否在购物车中
        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(lqw);
        if (cartServiceOne != null) {
            //如果已经存在，就在原来的数量基础上加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        } else {
            //如果不存在，则添加到购物车，数量默认就是一
            shoppingCart.setNumber(1);
            shoppingCart.setUserId(currentId);
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 从购物车删除菜品或套餐
     * @param shoppingCart
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart) {
        //获取当前用户id,并添加到购物车的user_id列
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        //判断要删除的是菜品还是套餐
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId, currentId);
        if (dishId != null) {
            //要删除一个菜品
            lqw.eq(ShoppingCart::getDishId, shoppingCart.getDishId());
        } else {
            //要删除一个套餐
            lqw.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }
        //查
        ShoppingCart cartServiceOne = shoppingCartService.getOne(lqw);
        //判断当前菜品或套餐在购物车的数量是多少，是1，则从购物车删除，大于1，数量减一
        Integer number = cartServiceOne.getNumber();
        cartServiceOne.setNumber(number - 1);
        if (number > 1) {
            //数量减1，并修改此条购物车数据
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //删除此条购物车
            shoppingCartService.removeById(cartServiceOne.getId());
        }
        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list() {
        log.info("查看购物车");
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        lqw.orderByAsc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(lqw);
        return R.success(list);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean() {
        //SQL:delete from shopping_cart where user_id = ?
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        shoppingCartService.remove(lqw);
        return R.success("清空购物车成功");
    }
}
